Home           Contact us           FAQs           
     Journal Home     |     Aim & Scope    |    Author(s) Information      |     Editorial Board     |     MSP Download Statistics
2012 (Vol. 4, Issue: 3)
Article Information:

Sensitivity of Progeny of Phytophthora infestans to Fungicides

Diana M. Earnshaw and Richard C. Shattock
Corresponding Author:  Diana M. Earnshaw 

Key words:  Azoxystrobin, cymoxanil, fungicide resistance, metalaxyl sensitivity, phenylamides, Phytophthora infestans, propamocarb hydrochloride
Vol. 4 , (3): 213-224
Submitted Accepted Published
March 03, 2012 March 24, 2012 May 05, 2012

This study investigated fungicide sensitivity of progeny of Phytophthora infestans at the University of Wales, Bangor. Sexual progeny were derived from an A2 parent that was Metalaxyl Sensitive (MS) with three A1 parents that were: MS, MS and MR (metalaxyl resistant). Sporangial and zoosporangial progeny from the parent and from some sexual progeny were also assessed. The different isolates were grown on Rye B Agar amended with different concentrations of one of five different fungicides: Metalaxyl, Propamocarb hydrochloride, Cymoxanil, Fluazinam and Azoxystrobin. The results indicated that in metalaxyl, the sensitivity of sporangial progeny was similar to that of the parent isolates, however that of zoosporangial progeny ranged from being Intermediate (MI) to being Resistant (MR) if the parents were Resistant (MR) or from Sensitive (MS) to being Intermediate (MI) if the parents were Sensitive (MS). No resistance was observed among progeny that were exposed to Azoxystrobin. With the other fungicides, there was a variation in the sensitivity of sporangial and zoosporangial progeny e.g. some sensitive sporangia gave rise to highly resistant zoospores. The results showed that resistance to the most commonly used fungicides against late blight is possible. Although no resistance to the new fungicide azoxystrobin was observed, the appearance of resistance to it among other fungal pathogens has been reported. Therefore, breeders are faced with a challenge of coming up with cultivars with reduced susceptibility to late blight and plant pathologists are to come up with a wide range of fungicides so that their use can be rotated to avoid build-up of resistance isolates.
Abstract PDF HTML
  Cite this Reference:
Diana M. Earnshaw and Richard C. Shattock, 2012. Sensitivity of Progeny of Phytophthora infestans to Fungicides.  Asian Journal of Agricultural Sciences, 4(3): 213-224.
    Advertise with us
ISSN (Online):  2041-3890
ISSN (Print):   2041-3882
Submit Manuscript
   Current Information
   Sales & Services
Home  |  Contact us  |  About us  |  Privacy Policy
Copyright © 2015. MAXWELL Scientific Publication Corp., All rights reserved